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【AES】
一种对称加密算法,DES的取代者。
加密相关文章见:Java 加密解密 对称加密算法 非对称加密算法 MD5 BASE64 AES RSA
【代码】
代码比较多,有一部分非本文章内容代码,具体自己看吧。
- package com.uikoo9.util.encrypt;
- import java.math.BigInteger;
- import java.security.MessageDigest;
- import java.security.SecureRandom;
- import javax.crypto.Cipher;
- import javax.crypto.KeyGenerator;
- import javax.crypto.spec.SecretKeySpec;
- import sun.misc.BASE64Decoder;
- import sun.misc.BASE64Encoder;
- import com.uikoo9.util.QStringUtil;
- /**
- * 编码工具类
- * 1.将byte[]转为各种进制的字符串
- * 2.base 64 encode
- * 3.base 64 decode
- * 4.获取byte[]的md5值
- * 5.获取字符串md5值
- * 6.结合base64实现md5加密
- * 7.AES加密
- * 8.AES加密为base 64 code
- * 9.AES解密
- * 10.将base 64 code AES解密
- * @author uikoo9
- * @version 0.0.7.20140601
- */
- public class QEncodeUtil {
- public static void main(String[] args) throws Exception {
- String content = "我爱你";
- System.out.println("加密前:" + content);
- String key = "123456";
- System.out.println("加密密钥和解密密钥:" + key);
- String encrypt = aesEncrypt(content, key);
- System.out.println("加密后:" + encrypt);
- String decrypt = aesDecrypt(encrypt, key);
- System.out.println("解密后:" + decrypt);
- }
- /**
- * 将byte[]转为各种进制的字符串
- * @param bytes byte[]
- * @param radix 可以转换进制的范围,从Character.MIN_RADIX到Character.MAX_RADIX,超出范围后变为10进制
- * @return 转换后的字符串
- */
- public static String binary(byte[] bytes, int radix){
- return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数
- }
- /**
- * base 64 encode
- * @param bytes 待编码的byte[]
- * @return 编码后的base 64 code
- */
- public static String base64Encode(byte[] bytes){
- return new BASE64Encoder().encode(bytes);
- }
- /**
- * base 64 decode
- * @param base64Code 待解码的base 64 code
- * @return 解码后的byte[]
- * @throws Exception
- */
- public static byte[] base64Decode(String base64Code) throws Exception{
- return QStringUtil.isEmpty(base64Code) ? null : new BASE64Decoder().decodeBuffer(base64Code);
- }
- /**
- * 获取byte[]的md5值
- * @param bytes byte[]
- * @return md5
- * @throws Exception
- */
- public static byte[] md5(byte[] bytes) throws Exception {
- MessageDigest md = MessageDigest.getInstance("MD5");
- md.update(bytes);
- return md.digest();
- }
- /**
- * 获取字符串md5值
- * @param msg
- * @return md5
- * @throws Exception
- */
- public static byte[] md5(String msg) throws Exception {
- return QStringUtil.isEmpty(msg) ? null : md5(msg.getBytes());
- }
- /**
- * 结合base64实现md5加密
- * @param msg 待加密字符串
- * @return 获取md5后转为base64
- * @throws Exception
- */
- public static String md5Encrypt(String msg) throws Exception{
- return QStringUtil.isEmpty(msg) ? null : base64Encode(md5(msg));
- }
- /**
- * AES加密
- * @param content 待加密的内容
- * @param encryptKey 加密密钥
- * @return 加密后的byte[]
- * @throws Exception
- */
- public static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
- KeyGenerator kgen = KeyGenerator.getInstance("AES");
- kgen.init(128, new SecureRandom(encryptKey.getBytes()));
- Cipher cipher = Cipher.getInstance("AES");
- cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
- return cipher.doFinal(content.getBytes("utf-8"));
- }
- /**
- * AES加密为base 64 code
- * @param content 待加密的内容
- * @param encryptKey 加密密钥
- * @return 加密后的base 64 code
- * @throws Exception
- */
- public static String aesEncrypt(String content, String encryptKey) throws Exception {
- return base64Encode(aesEncryptToBytes(content, encryptKey));
- }
- /**
- * AES解密
- * @param encryptBytes 待解密的byte[]
- * @param decryptKey 解密密钥
- * @return 解密后的String
- * @throws Exception
- */
- public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
- KeyGenerator kgen = KeyGenerator.getInstance("AES");
- kgen.init(128, new SecureRandom(decryptKey.getBytes()));
- Cipher cipher = Cipher.getInstance("AES");
- cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(kgen.generateKey().getEncoded(), "AES"));
- byte[] decryptBytes = cipher.doFinal(encryptBytes);
- return new String(decryptBytes);
- }
- /**
- * 将base 64 code AES解密
- * @param encryptStr 待解密的base 64 code
- * @param decryptKey 解密密钥
- * @return 解密后的string
- * @throws Exception
- */
- public static String aesDecrypt(String encryptStr, String decryptKey) throws Exception {
- return QStringUtil.isEmpty(encryptStr) ? null : aesDecryptByBytes(base64Decode(encryptStr), decryptKey);
- }
- }
【输出】
- 加密前:我爱你
- 加密密钥和解密密钥:123456
- 加密后:A63fa7DjAe3yYji44BTm1g==
- 解密后:我爱你